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Table 2
Molecular emission lines detected in L2 Puppis.
| Molecule | Quantum numbers | Sky freq. ν | Rest freq. ν0 | Upper-state | |
| vibrational | rotational | (GHz) | (GHz) | energy (K) | |
|
|
|||||
| Unidentified | 330.437 | 330.477 | |||
| 13CO | ν= 0 | 3−2 | 330.552 | 330.588 | 31.732 |
| H2O | ν2 = 2 | 3(2,1)−4(1,4) | 331.08 | 331.12 | |
| 30SiO? | ν= 3 | 8−7 | 331.93 | 331.97 | |
| Unidentified | 331.99 | 332.03 | |||
| SO2 | ν= 0 | 21(2,20)−21(1,21) | 332.055 | 332.091 | 219.525 |
| SO2 | ν= 0 | 34(3,31)−34(2,32) | 342.724 | 342.762 | 581.919 |
| 29SiO | ν= 0 | 8−7 | 342.943 | 342.981 | 74.077 |
| SiS | ν= 1 | 19−18 | 343.063 | 343.101 | 1235.828 |
| SO 3Σ | ν= 0 | 8(8)−7(7) | 344.272 | 344.311 | 87.482 |
| 12CO | ν= 0 | 3−2 | 345.758 | 345.796 | 33.192 |
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